Comment: 26:05 - 26:58 (00:53)
Source: Annenberg/CPB Resources - Earth Revealed - 14. Intrusive Igneous Rocks
Keywords: "igneous rock", intrusion, mineral, lithosphere, ore, metal, gem, "tectonic activity", planet, magma, crystal, ocean, continent, mountain, "James Sadd"
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Our transcription: Geologists can't study igneous intrusions directly; but by analyzing the minerals within these rocks and mapping their physical relationships, earth scientists are gaining an intimate understanding of the evolution of the lithosphere.
Research into intrusive igneous processes is now more important and interesting than ever.
For example, it is used in determining the location of metallic ores, precious metals, and gems, for interpreting the complexities of plate tectonics, and in studying the history of other planets similar to our own.
Intrusive igneous rocks remind us that a great deal of geologic activity takes place in a vast, unseen arena.
There in the Earth's interior, magma continued to form, move about, and crystallize setting the stage for the growth of an ocean basins, the continents, and the mountain ranges of the future.
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Geology School Keywords
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